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Subject: [OMPI users] slowdown with infiniband and latest CentOS kernel
From: Noam Bernstein (noam.bernstein_at_[hidden])
Date: 2013-12-16 17:40:12

Has anyone tried to use openmpi 1.7.3 with the latest CentOS kernel
(well, nearly latest: 2.6.32-431.el6.x86_64), and especially with infiniband?

I'm seeing lots of weird slowdowns, especially when using infiniband,
but even when running with "--mca btl self,sm" (it's much worse with
IB, though), so I was wondering if anyone else has tested this kernel yet?

Once I have some more detailed information I'll follow up.